Answer: 50. The ratio 7:3 means the counts are 7k boys and 3k girls for some positive integer k, since 7 and 3 are coprime.
The total is therefore 10k, a multiple of 10. Among 21,37,50,73, only 50 qualifies; it gives 35 boys and 15 girls.
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Question 1 of 65
The ratio of boys to girls in a class is 7 to 3.
Among the options below, an acceptable value for the total number of students in the class is:
Answer: 50. The ratio 7:3 means the counts are 7k boys and 3k girls for some positive integer k, since 7 and 3 are coprime.
The total is therefore 10k, a multiple of 10. Among 21,37,50,73, only 50 qualifies; it gives 35 boys and 15 girls.